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Unit 4- Reactions and Equations

Total questions: 104

Worksheet time: 3hrs 47mins

Name
Class
Date
1.
What is the Law of Conservation of mass?
a)
Mass is created in a chemical reaction
b)
Mass is created in a physical change
c)
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
d)
Mass is never created or destroyed
2.
12g of Carbon react with 16g of Oxygen, how much carbon monoxide (CO) is formed? 
a)
28 g
b)
4g
c)
30g
d)
12g
3.
In the reaction shown by the equation, 252 grams of FeCl2 and 70 grams of Cl2 are consumed.
2FeCl2+ Cl2--> 2FeCl3 
How many grams of FeCl3 are produced? 
a)
161 grams
b)
182 grams
c)
322 grams
d)
392 grams
4.
Matter can not be created nor destroyed: it can only be
a)
Destroyed a little bit
b)
Invisible
c)
Transformed, changed
d)
None of the above
5.
A chemical equation tells us 
a)
the reactants and the products.
b)
the elements that make up the reactants and the products.
c)
the number of atoms that make up the reactants and the products.
d)
All of the above.
6.
24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride
a)
62 
b)
38
c)
24
d)
14
7.
In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 
a)
4g
b)
5g
c)
9g
d)
14g
8.
If a reaction starts with a total 75g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 75g of products
c)
a total of 180 g of products
d)
None of the above
9.
In the reaction AB-----> A + B reactant AB has 12g and product B has 5g. How many grams should product A have?
a)
17g
b)
2g
c)
7g
d)
None of the above
10.

What is the part of the chemical equation in green called?

Fe + S → FeS

a)

products

b)

reactants

c)

yield

d)

input

11.

Sodium and chlorine combine to form sodium chloride, or table salt. Sodium and chlorine are:

a)

Producers

b)

Products

c)

Reactionaries

d)

Reactants

12.

4 grams of hydrogen and 32 grams of oxygen will combine to form:

a)

36 grams of water

b)

28 grams of hydroxide

c)

32 grams of oxygen

d)

36 grams of deuterium

13.

In a chemical reaction, 4 grams of sodium must combine with how many grams of chlorine to produce 10 grams of table salt?

a)

4 grams

b)

6 grams

c)

8 grams

d)

10 grams

14.

What do we call the chemicals that result from a chemical reaction?

a)

reactants

b)

products

c)

subscripts

d)

coefficients

15.

According to the Law of Conservation of Mass, what happens to the wood and oxygen when it is burned?

a)

The wood disappears.

b)

It stays the same chemically.

c)

The atoms in the wood and oxygen rearrange and form smoke and ash.

d)

Nothing.

16.

What is the left part of a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical equation

17.

What is the right part of a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical Equation

18.

What is the total number of atoms present in 5Na3PO4?

a)

5

b)

55

c)

40

d)

8

19.

How many Mn atoms are found in the following compound?

2MnO4

a)

1

b)

2

c)

4

d)

8

20.

What is the little number after an element in a chemical equation called?

Example: H2

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

21.

Is the following equation balanced?

Al + O2 ---> 2Al2O3

a)

YES

b)

NO

22.

What is the number before a chemical formula called?

Example: 2H2 + O2 ---> 2H2O

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

23.

How many elements are in C6H12O6?

a)

1

b)

2

c)

3

d)

4

24.

Which of the following equations are correctly balanced?

a)

12CO2 + H2O ---> C6H12O6 + O2

b)

CO2 + H2O ---> 3C6H12O6 + O2

c)

CO2 + 9H2O ---> C6H12O6 + O2

d)

6CO2 + 6H2O ---> C6H12O6 + 6O2

25.

Balance this equation:

H2 + Cl2 ---> HCl

a)

It is balanced.

b)

H2 + Cl2 ---> 2HCl

c)

3H2 + Cl2 ---> 6HCl

d)

H2 + 3Cl2 ---> 6HCl

26.

Balance this equation:

HgO ---> 2Hg + O2

a)

It is balanced.

b)

2HgO ---> 2Hg + O2

c)

2HgO ---> Hg + O2

d)

HgO ---> Hg + 2O2

27.

Complete the sentence.


During a chemical reaction, atoms ________.

a)

can appear

b)

can disappear

c)

get rearranged

d)

stop moving and vibrating

28.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number in front of a chemical formula.
c)
The number in between the chemical symbols.
d)
The number behind a chemical formula.
29.

What is the Law of Conservation of Mass?

a)

It states that matter cannot be created or destroyed.

b)

It states that energy cannot be created or destroyed.

c)

It states that matter can be created or destroyed.

d)

It states that sound can be created or destroyed.

30.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
31.
What are the smaller numbers that you CANNOT change in a chemical equation? 
a)
Coefficient
b)
Products
c)
Reactants
d)
Subscript
32.

Balance the following equation:

___ H2+ ___ O2→___ H2O

a)

1, 1, 3

b)

2, 2, 2

c)

1, 2, 1

d)

2,1, 2

33.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
34.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
35.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
36.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
37.
KNO3 --> KNO2 + O2
What coefficients are needed to balance the reaction?
a)
2, 2, 1
b)
2, 3, 2
c)
1, 2, 2
d)
1, 3, 1
38.
Balance this equation-
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
39.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
40.
Balance this equation.
_CH4 + _O2 --> _CO2 + _H2O
a)
1,2,1,1
b)
2,1,2,1
c)
1,2,1,2
d)
0,2,0,2
41.

What are the products when nitric acid reacts with lithium?

a)

lithium nitrate + hydrogen gas

b)

lithium nitric + hydrogen gas

c)

lithium nitrate + water

d)

lithium nitric + water

42.

What are the products when sulfuric acid reacts with calcium carbonate?

a)

calcium sulfur + water + carbon dioxide

b)

calcium sulfur+ carbon dioxide

c)

calcium sulfate + water + carbon dioxide

d)

calcium sulfate + carbon dioxide

43.

What are the products formed when hydrochloric acid reacts with sodium hydroxide?

a)

sodium chloride and hydrogen

b)

sodium chloride and water

c)

sodium chloric and water

d)

chloride sodium and water

44.

What can X be?


sulfuric acid + X --> magnesium sulfate and water

a)

magnesium

b)

magnesium oxide

c)

magnesium chloride

d)

magnesium ammonium

45.

What is the gas produce when nitric acid is added to calcium?

a)

oxygen

b)

hydrogen

c)

carbon dioxide

d)

ammonia

46.

Which of the following with react with hydrochloric acid to produce calcium chloride, water and carbon dioxide?

a)

calcium

b)

calcium nitrate

c)

calcium oxide

d)

calcium carbonate

47.

Iron + ________________ --> iron sulfate + copper

What is missing?

a)

Copper (II) oxide

b)

Copper (II) sulfate

c)

Iron (II) sulfate

d)

Iron (II) oxide

48.

Magnesium + hydrochloric acid --> _____________ + hydrogen


What is missing?

a)

Magnesium oxide

b)

Magnesium hydride

c)

Magnesium chloride

d)

Magnesium hydroxide

49.

Magnesium + ________ --> magnesium oxide


What is missing?

a)

Hydrogen

b)

Sulphur

c)

Oxygen

d)

Oxide

50.

Potassium iodide + lead (II) nitrate --> _____________ + lead (II) iodide

What is missing?

a)

lead (II) nitrate

b)

potassium nitrate

c)

nitrogen

d)

potassium iodide

51.

Copper (II) oxide + _______________ -> copper (II) sulfate + water

What is missing?

a)

sulfuric acid

b)

hydrochloric acid

c)

hydrogen

d)

oxygen

52.

________________ --> copper (II) oxide + carbon dioxide

What is missing?

a)

copper (II) sulfate

b)

copper (II) nitrate

c)

copper (II) carbonate

d)

copper (II) hydroxide

53.

Methane + oxygen

a)

water + carbon

b)

carbon monooxide + water

c)

oxygen gas + water

d)

carbon dioxide + water

54.

All of the following are indicators of a chemical reaction except one. Which one is NOT an indicator that a chemical reaction has taken place?

a)

the production of heat or light

b)

a color change

c)

the production of gas bubbles

d)

the dissolving of one substance in another

55.

A student places a piece of a potato into a container of hydrogen peroxide and observes bubbles forming around the potato. The presence of bubbles might indicate the formation of a new substance because bubbles -

a)

could show that a gas is forming

b)

always rise to the top of a liquid.

c)

are almost always perfectly spherical.

d)

usually burst after a few minutes.

56.

Hydrogen peroxide breaks down to form water and oxygen gas. A thermometer indicates an increase in temperature. Which observation is evidence that a chemical reaction has occurred?

a)

The mass of the solution remains the same.

b)

Phase changes are observed.

c)

The color of the solution remains clear.

d)

The temperature of the solution increases.

57.
In a container, a solid consisting of clear crystals is combined with a blue liquid and the following observations are obtained.
 How many of the listed observations indicate a new substance was formed?
a)
1
b)
2
c)
3
d)
4
58.
Four students performed four different investigations by combining different substances. Which of the observations is most indicative of a chemical reaction?
a)
investigation 1
b)
investigation 2
c)
investigation 3
d)
investigation 4
59.

A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?

a)

The level of the substance in the beaker is higher after the other liquid is added.

b)

A yellow solid forms and then settles to the bottom of the beaker.

60.

Which of the following describes a precipitate?

a)

a new liquid forms when a solid reactant is heated and melts

b)

a new solid product formed from two aqueous reactants

c)

a new gas forms when a solid is dissolved in a liquid

d)

bubbles form when two aqueous reactants are mixed

e)

a new solid forms when an aqueous reactant freezes

61.

Examine the chemical equation. Check the box(es) below of the particular indicator(s) present in the equation.


HCl (aq) + NaOH (aq) --> NaCl (aq) + H2O (l)

a)

formation of water

b)

formation of a gas

c)

formation of a precipitate

d)

color change

e)

energy change

62.

Examine the chemical equation. Check the box(es) below of the particular indicator(s) present in the equation.


AgNO3 (aq) + NaCl (aq) --> AgCl (s) + NaNO3 (aq)

a)

formation of water

b)

formation of a gas

c)

formation of a precipitate

d)

color change

e)

energy change

63.

Examine the chemical equation. Check the box(es) below of the particular indicator(s) present in the equation.


Na2CO3 (s) + HCl (aq) --> H2O (g) + NaCl (aq) + CO2 (g)

a)

formation of water

b)

formation of a gas

c)

formation of a precipitate

d)

color change

64.

Examine the chemical equation. Check the box(es) below of the particular indicator(s) present in the equation.

a)

gas evolution

b)

color change

c)

precipitate formation

d)

energy change

e)

water formation

65.

Examine the chemical equation. Check the box(es) below of the particular indicator(s) present in the equation.

a)

gas evolution

b)

color change

c)

precipitate formation

d)

energy change

e)

water formation

66.

Examine the chemical equation. Check the box(es) below of the particular indicator(s) present in the equation.

a)

gas evolution

b)

color change

c)

precipitate formation

d)

energy change

e)

water formation

67.

An aqueous, cloudy, white baking soda solution was combined with solid, powdery, white calcium chloride. Once combined, the temperature of the test tube increased and bubbling occurred creating an aqueous, cloudy, white solution with a flaky, white solid. What indicators of a chemical change are present?

a)

energy change

b)

Color change

c)

gas bubbling

d)

precipitate formation

68.
The molar mass of an element is equal to its...
a)
Atomic mass
b)
Atomic number
c)
Oxidation number
d)
Valence electrons
69.
The mass of one mole of substance is called...
a)
molecular mass
b)
mole constant
c)
molar mass
d)
atomic weight
70.

Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO2. Silica is one of the most complex and most abundant families of materials, existing as a compound of several minerals and as synthetic product. What is the formula mass of the covalent compound silicon dioxide (SiO2)?

a)

7193.6 amu

b)

30.0 amu

c)

44.1 amu

d)

60.1 amu

71.

Fluorine is added to city water supplies in the proportion of about one part per million to help prevent tooth decay. Several fluoride compounds are added to toothpaste, also to help prevent tooth decay. What is the molar mass of fluorine gas?

a)

18.998 amu

b)

38 amu

c)

9 amu

d)

18 amu

72.
What is the molar mass of table salt (NaCl)?
a)
116.886 g/mol
b)
35.453 g/mol
c)
22.990 g/mol
d)
58.443 g/mol
73.

Sodium hydroxide is used in many industries: in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents, and as a drain cleaner. What is the molar mass of NaOH?

a)

40 amu

b)

38.989 amu

c)

23.998 amu

d)

57.004 amu

74.
What is the mass of one mole of aluminum chloride (remember to determine the correct formula first)?
a)
62.435g
b)
116.399g
c)
133.341g
d)
97.888g
75.
What is the molar mass of CO2?
a)
12
b)
16
c)
32
d)
44
76.

Potassium sulfide is the inorganic compound with the formula K2S. Potassium sulfides are formed when black powder is burned and are important intermediates in many pyrotechnic effects, such as senko hanabi and some glitter formulations. What is the molar mass of K2S?

a)

110.3 amu

b)

110 amu

c)

78.2 amu

d)

110.2 amu

77.

What is the molar mass of Cs2SO4 ?

a)

361.9

b)

361.8

c)

313.9

d)

180

78.
What is the percent by mass of oxygen in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
79.
What is the percent by mass of magnesium in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
80.
What is the percent by mass of sodium in NaCl?
a)
39%
b)
61%
c)
35%
d)
65%
81.
What is the percent by mass of chlorine in NaCl?
a)
39%
b)
61%
c)
35%
d)
65%
82.
What is the percent by mass of fluorine in CaF2 (gram-formula mass = 78 g/mol)?
a)
24%
b)
49%
c)
51%
d)
65%
83.
What is the percent by mass of calcium in CaF2 (gram-formula mass = 78 g/mol)?
a)
24%
b)
49%
c)
51%
d)
65%
84.
What is the percent composition by mass of sulfur in the compound MgSO4 (gram formula mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
85.
What is the percent composition by mass of magnesium in the compound MgSO4 (gram formula mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
86.
What is the percent composition by mass of oxygen in the compound MgSO4 (gram formula mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
87.
In which compound is the percent composition by mass of Cl equal to 42%?
a)
HClO (gram formula mass = 52 g/mol)
b)
HClO2 (gram formula mass = 68 g/mol)
c)
HClO3 (gram formula mass = 84 g/mol)
d)
HClO4 (gram formula mass = 100 g/mol)
88.
What is the percent composition of Benzene, C6H6?
a)
C = 50%
H = 50%
b)
C = 85.7 %
H = 14.3%
c)
C = 92.2%
H = 7.8%
d)
C = 71.9%
H = 28.1%
89.
Find the percent composition of Cu2S?
a)
%Cu= 67.987 %S= 32.013
b)
%Cu= 79.854   %S= 20.145
c)
%Cu= 35.946   %S= 64.054
90.

Which element has an abundance of 39.03% in the compound sodium phosphate, Na3PO4

a)

Na

b)

P

c)

O

d)

None of the above

91.

Which element in the compound potassium cyanide, KCN, has a percent composition of 60.97%?

a)

K

b)

C

c)

N

d)

None of the above

92.
A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?
a)
Mg4N3
b)
MgN2
c)
Mg3N2 
d)
MgN
93.
You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.
a)
SO
b)
SO2
c)
SO3
d)
SO4
94.
Which of the following is considered an empirical formula?
a)
CH3COOH
b)
C6H12O6
c)
H2O
95.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
96.
A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?
a)
Mg4N3
b)
MgN2
c)
Mg3N2 
d)
MgN
97.
A formula with the lowest whole # ratio of elements in a compound is called
a)
Molecular Formula
b)
Chemical Formula
c)
Empirical Formula 
d)
Distance Formula
98.
Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?
a)
C2H3O2
b)
CH2O
c)
C2H4O2
d)
C3H8O3
99.

2.40 g of an explosive, J, contains 0.473 g of nitrogen. J also contains 33.8% carbon and 1.41% hydrogen by mass. The remainder of J is oxygen.


What is the empirical formula of J?

a)

C4HNO2

b)

CH2N2O

c)

C2HNO2

d)

CHNO

100.

2.40 g of an explosive, J, contains 0.473 g of nitrogen. J also contains 33.8% carbon and 1.41% hydrogen by mass. The remainder of J is oxygen.


What is the empirical formula of J?

a)

C4HNO2

b)

CH2N2O

c)

C2HNO2

d)

CHNO

101.
What is the molecular formula for a compound with the empirical formula: K2SO4 and a molecular mass of 696g.
a)
K2SO4 
b)
K8SO16
c)
K8S4O8 
d)
K8S4O16 
102.
What is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?
a)
CH2O
b)
C2H4O2
c)
C4H8O4
d)
C6H12O6
103.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
104.
A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________
a)
ionic formula
b)
covalent formula
c)
empirical formula
d)
molecular formula

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